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" ... At the time the studies were dropped, Penny says cost estimates for such a mission ran about $3 billion. And there was also competition from astronomers who advocated doing similar missions using an optical coronagraph (a telescopic attachment that blocks out a star’s light) and/or a starshade (a telescopic screen used to occult a star’s light). The latter starshade idea prompted the notion that it could be done as an add-on to NASA’s WFIRST (Wide-Field Infrared Survey Telescope). ... "
" ... The Habitable Exoplanets Observatory (HabEx). The ultimate goal of HabEx is simple: to directly image Earth-like planets around other Sun-like stars. While other observatories will detect such worlds indirectly, or image larger planets farther away from smaller stars, HabEx plans to fill that ultimate of niches: imaging a world like our own around a star like our own. A space-based optical telescope with a 4-meter diameter, combined with a starshade, will enable this great leap forward for astronomy. ... "
" ... There are future missions in the pipeline that are poised to take the next great leap in planet-finding and in learning more about these planets. James Webb will allow direct imaging of large, distant exoplanets, and will potentially measure the atmospheric contents of worlds only twice the diameter of Earth. WFIRST will be even more successful at planet-hunting than Kepler was, and if it launches with a starshade, could look for organic signs on Earth-sized planets that are close enough to our own world. There are big breakthroughs ahead, but they're on a relatively distant horizon. ... "